Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Afternoon, if the rpm's are going up when in gear and not in park or neutral then the most likely issue is that the torque converter is staying locked up. This will surely be a trans issue. You could have a bad torque converter.....valve body issue.....or other internal failure causing the torgue converter to stay locked up fully. I have come across this issue a few times at the dealership and it was a bit scary how you had to hard the brakes as hard as you could so that the truck didn't want to take off. Each time the customer opted to take the vehicle. They had over 100k miles and we have a rule that we don't rebuild at our shop or overhaul with over 100k miles, only replace.
The way to determine if the issue is electrical (external) or an internal trans issue is to start the vehicle and then unplug the trans electrical connector on the driver side of the trans. There is one just about the trans pan that goes in horizontal. There is another connector near all the trans linkage that goes vertical. I'm attaching a pic that shows the item I mentioned to disconnect. It is labeled #1.
If the rpm's return to normal when in gear at that point then the issue is external. If still no change then internal trans issue
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